diff --git a/ym.js b/ym.js
index 1164f19..5e073c2 100644
--- a/ym.js
+++ b/ym.js
@@ -237,7 +237,7 @@ function start(_config, _logger) {
             else if (message.indexOf('!ping') == 0) {
 
                 logger.info("Ping request by pm");
-                pm(data.partner, 'PONG');
+                pm(partner, 'PONG');
 
             }
             else if (message.indexOf('!terminate') == 0) {